The events both happen on the bank holiday weekend in August (on Friday, Saturday, Sunday), and share the same bill (occasionally with one or two exceptions).
The third NJF Festival saw the first non-Jazz acts appear, notably the Rolling Stones and Long John Baldry on the Sunday afternoon.
Cream were billed as 'Eric Clapton – Jack Bruce – Ginger Baker' as the band were still unnamed when promotional posters & advertising were printed.
Pink Floyd pulled out on Saturday evening due to singer/guitarist Syd Barrett's health problems and were replaced by The Nice.
The 1970 Festival was a four-day event for the only time in its history, with a South of England Local Talent session in the main arena on the Thursday evening.
Frankie Miller, Widowmaker, Racing Cars, Blue, Tiger, and Hand Reef all made appearances, but their place on the lineup is unclear.
Stan Webb's Chicken Shack pulled out due to illness and were replaced at short notice by Atomic Rooster.
Liberty 37 (unknown position) Also included Big Leaves, Black Box Recorder, Cha Cha Cohen, Chicks, Cube, Cyclefly, Dark Star, Dawn of the Replicants, Experimental Pop Band, The Jellys, Jim's Super Stereo World, Linoleum, Llama Farmers, Medal, Mercedes, The Motorhomes, Muse, Peeps Into Fairyland, Quasi, Rico, The Rocking Horses, Rosita, Seafood, Silt, Sonia Fariq, Stroke, Venni, The Webb Brothers, Witness Orgy were due to open the Main Stage Reading Sunday/Leeds Monday, but pulled out days before the event.
Originally booked play on the mainstage Eminem had to pull out a few weeks prior for legal reasons in America.
See Radio 1 Lock-Up Stage In 2005 My Chemical Romance played Reading and Leeds on the same day, in an alteration from the original schedule, due to the MTV Video Music Awards.
Kaiser Chiefs played a secret slot on the Carling Stage at the Leeds leg of the event under the pseudonym of 'Hooks for Hands'.
[8][9] Comedy: Doug Stanhope, Tim Minchin, Brendon Burns, Jack Whitehall, Junior Simpson, Sarah Millican, Tom Stade, Hugh Lennon, MC Matt Read, MC Martin Bigpig, Steve Gribbin, Kevin Bridges, Holly Walsh, Stephen Grant, Markus Birdman, Stuckey & Murray, Jessica Delfino, Dan Nightingale, Gary Delaney, Mark Olver, Daniel Townes, MC Dave Twentyman, Joey Page, Doc Brown, Jamie Kilstein, Joe Bor, Tomb.
Spoken Word: Aidan Moffat, The PeteBox, Kae Tempest, Mik Artistik, John Berkavitch Debate: ID Instigate Debate Late Night Entertainment: Smash N' Grab, Swap-A-Rama, Transgressive Records Film: Le Donk screening plus Q&A session with Mark Herbert and special guests from the film, 3D Night Of The Living Dead, This Is Spinal Tap, Anvil!
Jane's Addiction were due to headline the NME/Radio 1 Stage but cancelled both their appearances at the last minute – after arriving at the Reading site – due to frontman Perry Farrell falling ill. Rise Against played a secret acoustic set on the BBC Introducing Stage at Reading after their mainstage slot.
[17] Tyler, the Creator had originally been booked to play on the NME Stage, but was forced to cancel these shows after being refused entry into the United Kingdom.
Modern Baseball had planned to play the Lock Up Stage, but withdrew the week before the festival due to the lead singer's decision to focus on tackling his depression.
Mastodon had originally been booked to headline the Pit stage, but pulled out when they cancelled their European tour, citing a 'personal family matter.
Travis Scott was also a headliner for the Radio 1Xtra stage, cancelled all remaining UK tour shows also due to unforeseen circumstances, he was replaced by Stormzy.
Tyler Joseph of Twenty One Pilots was pulled down into the crowd during their performance of "Car Radio", at Reading 2016 and their set was cut short.
Several artists dropped out of Reading & Leeds for currently unknown reasons, this included Bishop Briggs, Katy B, A2 and K.I.D.
On the first day of the festival, Royal Republic, who were the opening act on the main stage for Friday at Leeds, cancelled for personal reasons, they were replaced by the Xcerts.
Skepta was billed to headline the Radio 1 tent on Sunday but was removed from the lineup, with "logistical issues" being cited as the reason.
Other notable removals were Ski Mask The Slump God who pulled out due to touring commitments and was replaced by Bhad Bhabie and Brunswick who was also due to play the Dance Stage but was replaced by Madam X, Skinny Girl Diet were due to open the Radio 1 Stage on Sunday but were replaced by Twisted Wheel, Famous Dex was to play the Radio 1 Stage on Sunday but pulled out and Playboi Carti cancelled not long before the festival for personal reasons.
English indie rock band Blaenavon was to be a headlining act on the Festival Republic Stage, but on 20 June pulled out due to 'on-going health issues'.
Fellow UK drill rapper Unknown T was also removed after he was charged with murder and violent disorder after allegedly stabbing 20-year-old Steven Narvaez-Jara during a party.
Acts were pushed up, Yungblud and Mayday Parade swapped places, and SWMRS was upgraded from Festival Republic to the Main Stage.